My favourite first stage starters are Piplup and Tepig because they're both so ridiculously cute and they're both Pokémon which you can tell will evolve to reach their full potential, and my least favourite first stage starters are Totodile and Oshawott because I find them both to be really ugly haha. My favourite fully evolved starter is Infernape because it's a badass and a lot of fun to use (plus I'm not hugely fond of any of the others) and my least favourite is Feraligatr - that family is my least favourite in the whole of the Pokémon world and I deeply wish they'd never been made.

As for including X&Y, Chespin's my new favourite base form! It's way too cute omg.